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CVE-2026-42792VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red Hat erlangSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-42792· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium · fixed in Ubuntu package updates : update the Ubuntu erlang package when convenient.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1:16.b.3-dfsg-1ubuntu2.2+esm2, 1:18.3-dfsg-1ubuntu3.1+esm3, 1:20.2.2+dfsg-1ubuntu2+esm3 +4
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=resoluteOther threatsAffected
  • <1:27.3.4.6+dfsg-1ubuntu0.1
Fixed in
  • 1:27.3.4.6+dfsg-1ubuntu0.1
Ubuntu 24.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=nobleOther threatsAffected
  • <1:25.3.2.8+dfsg-1ubuntu4.7
Fixed in
  • 1:25.3.2.8+dfsg-1ubuntu4.7
Ubuntu 22.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=jammyOther threatsAffected
  • <1:24.2.1+dfsg-1ubuntu0.7
  • =1:24.2+dfsg-1
Fixed in
  • 1:24.2.1+dfsg-1ubuntu0.7
Ubuntu Pro 20.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=esm-infra/focalOther threatsAffected
  • <1:22.2.7+dfsg-1ubuntu0.5+esm2
  • =1:22.2+dfsg-1
Fixed in
  • 1:22.2.7+dfsg-1ubuntu0.5+esm2
Ubuntu Pro 18.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <1:20.2.2+dfsg-1ubuntu2+esm3
Fixed in
  • 1:20.2.2+dfsg-1ubuntu2+esm3
Ubuntu Pro 16.04 LTSerlangpkg:deb/ubuntu/erlang?arch=source&distro=esm-infra-legacy/xenialOther threatsAffected
  • <1:18.3-dfsg-1ubuntu3.1+esm3
Fixed in
  • 1:18.3-dfsg-1ubuntu3.1+esm3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated RPM packages (erlang27 version 27.3.4.15-0.1.hum1) that fix the vulnerabilities described. Users should apply these official updates to affected Red Hat Hardened Images to remediate the issue. No alternative mitigations or workarounds are specified in the advisory. Patch status is confirmed as fixed in the provided updated packages.

Description

Improper Handling of Exceptional Conditions vulnerability in Erlang OTP erts (epmd) allows an unauthenticated remote attacker to permanently terminate the Erlang Port Mapper Daemon (epmd) via connection slot exhaustion. The do_accept function in erts/epmd/src/epmd_srv.c calls epmd_cleanup_exit() when accept(2) returns EMFILE (per-process file descriptor limit reached) or ENFILE (system-wide file descriptor limit reached), rather than treating these as recoverable conditions. An attacker can exhaust epmd's file descriptor slots by holding many TCP connections open while periodically sending a single byte to reset the idle timeout, then causing accept(2) to return EMFILE, which kills the daemon. epmd has no per-source-IP connection cap, making the attack feasible from a single source. On Debian/Ubuntu default packaging the impact is amplified: the systemd unit inherits a low file descriptor soft limit, and repeated daemon deaths trigger systemd's start-rate-limit, permanently failing both epmd.service and epmd.socket and requiring manual operator intervention to recover. This issue affects OTP from OTP 17.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15.

References

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