VulnerabilityPublished 29 Oct 2026Updated 30 Oct 2026

CVE-2026-101516: java-21-openjdk security update for AlmaLinux 8 and 9

Affects java-21-openjdkSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-101516· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium : upgrade to 1:21.0.13.0.9-1.1.el8 when convenient.

Data as of 30 Oct 2026, 13:33 UTC

CVSS 3.1 base score

6.5Medium

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 1:21.0.13.0.9-1.1.el8

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

almalinux-8

What to do

Upgrade the AlmaLinux java-21-openjdk package to 1:21.0.13.0.9-1.1.el8.

Patches and advisories

access.redhat.com/errata/RHSA-2026:88349 (opens in a new tab)

Affected software

Product	Affected	Fixed in
AlmaLinux 8java-21-openjdk	Affected <1:21.0.13.0.9-1.1.el8	Fixed in 1:21.0.13.0.9-1.1.el8

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

Description

The OpenJDK 21 packages provide the OpenJDK 21 Java Runtime Environment and the OpenJDK 21 Java Software Development Kit. Security Fix(es): * JDK: Enhance PKCS5 padding (CVE-2026-83374) * JDK: Enhance TLS certificate handling (CVE-2026-83376) * JDK: Improve C2 loop transformations (CVE-2026-83378) * JDK: Enhance LDAP logins (CVE-2026-83380) * JDK: Enhance SASL Authentication (CVE-2026-83381) * JDK: Enhance WebRowSets (CVE-2026-83387) * JDK: Enhance HTTP Client Response Handling (CVE-2026-83395) * JDK: Enhance XML Processing (CVE-2026-83400) * JDK: Enhance XPath Expressions (CVE-2026-87290) * JDK: Enhance HTTP Server (CVE-2026-87291) * JDK: Enhance Network Clients (CVE-2026-87292) * JDK: Enhance Certificate Name Checks (CVE-2026-87294) * JDK: Enhance Template Handling (CVE-2026-87367) * JDK: Enhance HTTP Client (CVE-2026-91332) * JDK: Improve ciphertext handling (CVE-2026-91333) * JDK: Enhance JPEG loading (CVE-2026-91334) * JDK: Enhance Image Handling (CVE-2026-91335) * JDK: Enhance TLS handshakes (CVE-2026-91373) * JDK: Enhance jstatd (CVE-2026-91374) * JDK: Enhance jmod handling (CVE-2026-91375) * JDK: Enhance JShell (CVE-2026-91379) * JDK: Enhance Preferences (CVE-2026-91380) * JDK: Enhance HTTP client caching (CVE-2026-91394) * JDK: Enhance diagnostic sessions (CVE-2026-91397) * JDK: Enhance SOCKS5 support (CVE-2026-91398) * JDK: Enhance MIDI file handling (CVE-2026-91400) * JDK: Enhance zipfs (CVE-2026-91410) * JDK: Enhance font rendering (CVE-2026-91415) * JDK: Enhance GIF loading (CVE-2026-91418) * JDK: Enhance HTTP server parsing (CVE-2026-91451) * JDK: Enhance HTTP server (CVE-2026-91452) * JDK: Improve HTTP headers (CVE-2026-91453) * JDK: Enhance TLS Extensions (CVE-2026-91461) * JDK: Enhance krb5 tokens (CVE-2026-91462) * JDK: Enhance krb5 client (CVE-2026-91463) * JDK: Enhance Kerberos validation (CVE-2026-91464) * JDK: Enhance C2 comparisons (CVE-2026-91487) * JDK: Enhance Certificate Constraint Checking (CVE-2026-101516) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Note that the OpenJDK RPMs use the system certificate store, so the eMudhra CVEs (CVE-2026-91403 & CVE-2026-114820) should be resolved by updating the ca-certificates package.

References

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