252 lines
11 KiB
JSON
252 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-72818",
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"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"state": "PUBLISHED",
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"assignerShortName": "VulnCheck",
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"dateReserved": "2026-08-10T15:12:16.754Z",
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"datePublished": "2026-08-20T21:57:34.230Z",
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"dateUpdated": "2026-09-24T14:18:57.476Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
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"shortName": "VulnCheck",
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"dateUpdated": "2026-09-24T14:18:57.476Z"
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},
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"datePublic": "2026-07-12T00:00:00.000Z",
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"title": "NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input",
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"descriptions": [
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{
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"lang": "en",
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"value": "The URLS regular expression in nltk/tokenize/casual.py, compiled into TweetTokenizer.WORD_RE and applied by TweetTokenizer.tokenize, contains a naked-domain branch whose domain-label prefix [a-z0-9]+(?:[.\\-][a-z0-9]+)* is unbounded. Input consisting of many alternating label separators can be partitioned in exponentially many ways, and because the branch also requires a trailing top-level domain that such input never supplies, the engine explores those partitions before failing at each offset. A few kilobytes of input therefore consumes seconds to minutes of single-threaded CPU, and the HANG_RE substitution performed before matching does not collapse the pattern. TweetTokenizer is intended for tokenizing untrusted social-media text, so any service that applies it, or the module-level casual_tokenize, to submitted text can be stalled per request without authentication. Version 3.10.1 bounds the label repetition."
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"description": "Inefficient Regular Expression Complexity",
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"cweId": "CWE-1333",
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"type": "CWE"
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}
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]
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}
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],
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"affected": [
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{
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"vendor": "nltk",
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"product": "nltk",
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"defaultStatus": "unaffected",
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"packageURL": "pkg:pypi/nltk",
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"collectionURL": "https://pypi.org",
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"packageName": "nltk",
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"repo": "https://github.com/nltk/nltk",
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"versions": [
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{
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"version": "0",
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"lessThan": "3.10.1",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "3.10.1",
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"status": "unaffected",
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"versionType": "semver"
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}
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],
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"programFiles": [
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"nltk/tokenize/casual.py"
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]
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}
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],
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"cpeApplicability": [
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"vulnerable": true,
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"criteria": "cpe:2.3:a:nltk:nltk:3.9.3:*:*:*:*:*:*:*"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:nltk:nltk:3.9.2:*:*:*:*:*:*:*"
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},
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},
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"criteria": "cpe:2.3:a:nltk:nltk:3.8:*:*:*:*:*:*:*"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:nltk:nltk:3.7:*:*:*:*:*:*:*"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:nltk:nltk:3.6.5:*:*:*:*:*:*:*"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:a:nltk:nltk:3.6.6:*:*:*:*:*:*:*"
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},
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{
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"vulnerable": true,
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}
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"metrics": [
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{
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"format": "CVSS",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "HIGH",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"baseScore": 8.7,
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"baseSeverity": "HIGH"
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}
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},
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{
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"format": "CVSS",
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"attackVector": "NETWORK",
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"attackComplexity": "LOW",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"scope": "UNCHANGED",
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"confidentialityImpact": "NONE",
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"integrityImpact": "NONE",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH"
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}
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}
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],
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"references": [
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{
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"url": "https://github.com/nltk/nltk/issues/3704",
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"tags": [
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"issue-tracking"
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],
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"name": "GitHub Issue #3704"
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},
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{
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"url": "https://github.com/nltk/nltk/blob/3.9.4/nltk/tokenize/casual.py",
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"tags": [
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"technical-description"
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],
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"name": "Unbounded naked-domain branch in the URLS pattern at 3.9.4"
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},
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{
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"url": "https://github.com/nltk/nltk/releases/tag/v3.10.1",
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"tags": [
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"release-notes"
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],
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"name": "NLTK v3.10.1 Release Notes"
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},
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{
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"url": "https://github.com/nltk/nltk",
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"tags": [
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"product"
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]
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},
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{
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"name": "VulnCheck Advisory: NLTK TweetTokenizer URL Pattern Backtracks Catastrophically on Naked-Domain-Like Input",
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"tags": [
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"third-party-advisory"
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],
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"url": "https://www.vulncheck.com/advisories/nltk-tweettokenizer-url-pattern-backtracks-catastrophically-on-naked-domain-like-input"
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "George Chen",
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"type": "finder"
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}
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],
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"x_generator": {
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"engine": "vulncheck-endgame"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/nltk/nltk/issues/3704",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-21T11:05:49.886911Z",
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"id": "CVE-2026-72818",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-21T11:06:07.858Z"
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}
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}
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]
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}
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} |