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CVE-2026-23943

Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang OTP ssh (ssh_transport modules) allows Denial of Service via Resource Depletion. The SSH transport layer advertises legacy zlib compression by default and inflates attacker-controlled payloads pre-authentication without any size limit, enabling reliable memory exhaustion DoS. Two compression algorithms are affected: * zlib: Activates immediately after key exchange, enabling unauthenticated attacks * zlib@op
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d2970bcebabd07941d5f5a1c5ebdaa918b6f13efcc921e91b39a04f4c6e9a1c9
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://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["ssh_transport"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/ssh/src/ssh_transport.erl"],"programRoutines":[{"name":"ssh_transport:decompress/2"},{"name":"ssh_transport:handle_packet_part/4"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"28.4.1","status":"unaffected"},{"at":"27.3.4.9","status":"unaffected"},{"at":"26.2.5.18","status":"unaffected"}],"lessThan":"*","s…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/affected/1

{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["ssh_transport"],"packageName":"ssh","packageURL":"pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/ssh_transport.erl"],"programRoutines":[{"name":"ssh_transport:decompress/2"},{"name":"ssh_transport:handle_packet_part/4"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"5.5.1","status":"unaffected"},{"at":"5.2.11.6","status":"unaffected"},{"at":"5.1.4.…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["ssh_transport"],"packageName":"erlang/otp","packageURL":"pkg:github/erlang/otp","product":"OTP","programFiles":["lib/ssh/src/ssh_transport.erl"],"programRoutines":[{"name":"ssh_transport:decompress/2"},{"name":"ssh_transport:handle_packet_part/4"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"28.4.1","status":"unaffected"},{"at":"27.3.4.9","status":"unaffected"},{"at":"26.2.5.18","status":"unaffected"}],"lessThan":"*","s…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/affected/1
{"cpes":["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"],"defaultStatus":"unknown","modules":["ssh_transport"],"packageName":"ssh","packageURL":"pkg:otp/ssh?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git","product":"OTP","programFiles":["src/ssh_transport.erl"],"programRoutines":[{"name":"ssh_transport:decompress/2"},{"name":"ssh_transport:handle_packet_part/4"}],"repo":"https://github.com/erlang/otp","vendor":"Erlang","versions":[{"changes":[{"at":"5.5.1","status":"unaffected"},{"at":"5.2.11.6","status":"unaffected"},{"at":"5.1.4.…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-409","description":"CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-23943.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/0c1c04b191f6ab940e8fcfabce39eb5a8a6440a4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/6
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/43a87b949bdff12d629a8c34146711d9da93b1b1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/4
{"tags":["patch"],"url":"https://github.com/erlang/otp/commit/93073c3bd338c60cd2bae715ce6a1d4ffc1a8fd3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/5
{"tags":["vendor-advisory","related"],"url":"https://github.com/erlang/otp/security/advisories/GHSA-c836-qprm-jw9r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-23943"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/2
{"tags":["x_version-scheme"],"url":"https://www.erlang.org/doc/system/versions.html#order-of-versions"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5a36838a53273b448862965d682db90ca5f4280ba81deeee23cbe7e7b6504c98 · sha256:fe4757995f8171a4… · /containers/cna/references/3

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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