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CVE-2026-7790

Uncontrolled Resource Consumption vulnerability in ninenines cowlib (cow_http_te module) allows Excessive Allocation. The chunked transfer-encoding parser in cow_http_te accepts an unbounded number of hex digits in the chunk-size field. Each digit causes a bignum multiplication (Len * 16 + digit), so parsing N hex digits requires O(N²) CPU work and O(N) memory. Additionally, when input is drip-fed, the parser discards the accumulated length on each partial read and restarts from zero on resumpt
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:55e2c64f5c7f0e728c6adcb9906f048c96828ae5d315924e177220df6f96955a
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_http_te"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_http_te.erl"],"programRoutines":[{"name":"cow_http_te:stream_chunked/2"},{"name":"cow_http_te:chunked_len/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.16.1","status":"affected","version":"0.6.0","versionType":"semver"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/affected/0

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_http_te"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_http_te.erl"],"programRoutines":[{"name":"cow_http_te:stream_chunked/2"},{"name":"cow_http_te:chunked_len/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"a4b8039ce8c93ab00867ef6b7e888822c09f4369","status":"affected","version":"8c0e428b012c59f553a264f285ed89d36f791e3e","versionType":"g…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://repo.hex.pm","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_http_te"],"packageName":"cowlib","packageURL":"pkg:hex/cowlib","product":"cowlib","programFiles":["src/cow_http_te.erl"],"programRoutines":[{"name":"cow_http_te:stream_chunked/2"},{"name":"cow_http_te:chunked_len/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"2.16.1","status":"affected","version":"0.6.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/affected/0
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:ninenines:cowlib:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["cow_http_te"],"packageName":"ninenines/cowlib","packageURL":"pkg:github/ninenines/cowlib","product":"cowlib","programFiles":["src/cow_http_te.erl"],"programRoutines":[{"name":"cow_http_te:stream_chunked/2"},{"name":"cow_http_te:chunked_len/4"}],"repo":"https://github.com/ninenines/cowlib","vendor":"ninenines","versions":[{"lessThan":"a4b8039ce8c93ab00867ef6b7e888822c09f4369","status":"affected","version":"8c0e428b012c59f553a264f285ed89d36f791e3e","versionType":"g…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","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","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"tags":["related","third-party-advisory"],"url":"https://cna.erlef.org/cves/CVE-2026-7790.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/references/0
{"tags":["patch"],"url":"https://github.com/ninenines/cowlib/commit/a4b8039ce8c93ab00867ef6b7e888822c09f4369"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/references/2
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-7790"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5aa10e4cef76ace7de2f948ed7cd81556bd0b8c2aeea76b172f12e2ae3347c3e · sha256:8fcbf8c35d56f342… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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