CVE-2026-55952

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tls_handshake_1_3:handle_pre_shared_key/3, an OfferedPreSharedKeys record with a mismatched number of identities and binders is forwarded directly to tls_server_session_ticket:use/4, which crashes the session ticket handler process.

An unauthenticated remote attacker can send a single crafted ClientHello to a TLS 1.3 server with session tickets enabled (stateful or stateless mode) and permanently disrupt session ticket handling on that listener. New TLS 1.3 handshakes complete but subsequently crash when the server attempts to issue a session ticket, effectively making TLS 1.3 unusable on the affected listener until the ssl application is restarted. TLS 1.2 connections are not affected.

This issue affects OTP from OTP 22.2 before OTP 29.0.3, OTP 28.5.0.3 and OTP 27.3.4.14, corresponding to ssl from 9.5 before 11.7.3, 11.6.0.3 and 11.2.12.10.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 2, 2026

Last Modified

July 24, 2026

Advisory Details (7)

Auto-updated Jul 2, 2026
Patch available. Sources: github_commit, github.
generic

Versions — Erlang System Documentation v29.0.3

https://www.erlang.org/doc/system/versions.html#order-of-versions
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-55952
github Patch Available

Denial-of-Service for TLS-1.3 server Using Session Tickets · Advisory · erlang/otp · GitHub

https://github.com/erlang/otp/security/advisories/GHSA-8c57-44c9-pc59
github_commit

commit e77823e6d980 (erlang/otp)

Fix landed in erlang/otp commit e77823e6d980 — awaiting tagged release

https://github.com/erlang/otp/commit/e77823e6d980b2ec0b4fe4ea3f2d098ca239e3ce
github_commit

commit 9b5437c72fa3 (erlang/otp)

Fix landed in erlang/otp commit 9b5437c72fa3 — awaiting tagged release

https://github.com/erlang/otp/commit/9b5437c72fa3403a75c1aba28e5c532bc191c662
github_commit

commit 2c3e59979764 (erlang/otp)

Fix landed in erlang/otp commit 2c3e59979764 — awaiting tagged release

https://github.com/erlang/otp/commit/2c3e599797644310e5d4aa39c7193420e59dadff
generic

TLS 1.3 server denial of service via malformed ClientHello pre-shared key extension | Erlang Ecosystem Foundation CNA

https://cna.erlef.org/cves/CVE-2026-55952.html

Vendor Advisories for CVE-2026-55952(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhaterlang27-main-27.3.4.17-1.hum12026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
erlang1:23.2.6+dfsg-1 ... 1:29.0~rc3+dfsg-4 (117 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
erlang1:25.2.3+dfsg-1 ... 1:29.0~rc3+dfsg-4 (78 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1, 1:27.3.4.1+dfsg-1+deb13u1, 1:27.3.4.1+dfsg-1+deb13u21:27.3.4.1+dfsg-1+deb13u3—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
erlang1:27.3.4.1+dfsg-1 ... 1:29.0~rc3+dfsg-4 (34 versions)1:29.0.3+dfsg-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 06:15 UTCEG score recompute
  3. 2026-09-18 06:15 UTCVendor advisory
  4. 2026-09-17 19:31 UTCEPSS rescore
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  9. 2026-09-14 00:15 UTCVendor advisory
  10. 2026-09-13 16:47 UTCEPSS rescore
  11. 2026-09-13 09:00 UTCEG score recompute
  12. 2026-09-13 09:00 UTCVendor advisory
  13. 2026-09-12 14:16 UTCEG score recompute
  14. 2026-09-12 14:16 UTCVendor advisory
  15. 2026-09-11 14:53 UTCEPSS rescore
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  1. 2026-08-30 22:20 UTCEG score recompute
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  7. 2026-08-27 14:25 UTCEPSS rescore
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  20. 2026-08-18 13:48 UTCEPSS rescore
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  24. 2026-08-16 14:56 UTCEPSS rescore
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  26. 2026-08-16 02:14 UTCEPSS rescore
  27. 2026-08-15 05:59 UTCEG score recompute
  28. 2026-08-15 01:30 UTCEPSS rescore
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  30. 2026-08-13 22:00 UTCEPSS rescore
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  40. 2026-08-07 22:39 UTCEG score recompute
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  55. 2026-07-30 22:02 UTCEG score recompute
  56. 2026-07-30 16:28 UTCEPSS rescore
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  66. 2026-07-25 14:18 UTCEPSS rescore
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  75. 2026-07-19 02:29 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-55952?
CVE-2026-55952 is a high vulnerability published on July 2, 2026. The Erlang/OTP ssl application does not validate that the PSK identity list and binder list carried in a TLS 1.3 ClientHello pre-shared key extension have equal length before passing them to the session ticket handler. In tlshandshake13:handlepresharedkey/3, an OfferedPreSharedKeys record with a…
When was CVE-2026-55952 disclosed?
CVE-2026-55952 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55952 actively exploited?
CVE-2026-55952 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 59.4% of all scored CVEs.
What is the CVSS score of CVE-2026-55952?
CVE-2026-55952 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-55952?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55952, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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