CVE-2026-113706 — a2aproject a2a-rs inmemory.rs information disclosure
A vulnerability was identified in a2aproject a2a-rs up to 0.4.3. Impacted is an unknown function of the file a2a-server/src/task_store/inmemory.rs. The manipulation of the argument historyLength leads to information disclosure. The attack is possible to be carried out remotely. The identifier of the patch is 68f1b7e772ae5d6c9e581ac9b48bcddd10fe70eb. To fix this issue, it is recommended to deploy a patch.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- EPSS 0.3% (30-day exploitation probability)+2
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (A2aproject A2a-rs).
- No fix documented in the sources: reduce exposure and monitor the vendor advisory.
- Exploitation requires user interaction: tighten email/web filtering and warn affected users.
- Search available logs for exploit probes matching the vulnerability class (info disclosure), errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| A2aproject | A2a-rs | version 0.4.0version 0.4.1version 0.4.2version 0.4.3 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 5.1 | CVSS 4.0 | Medium | — | — | cna@vuldb.com via NIST National Vulnerability Database |
| 5.1 | CVSS 4.0 | Medium | — | — | VulDB via CVE Program (cve.org) e CISA ADP |
| 3.5 | CVSS 3.1 | Low | 2.1 | 1.4 | cna@vuldb.com via NIST National Vulnerability Database |
| 3.5 | CVSS 3.1 | Low | — | — | GitHub, Inc. via GitHub Security Advisories |
| 3.5 | CVSS 3.1 | Low | — | — | VulDB via CVE Program (cve.org) e CISA ADP |
| 3.5 | CVSS 3.0 | Low | — | — | VulDB via CVE Program (cve.org) e CISA ADP |
| 4.0 | CVSS 2.0 | Medium | 8.0 | 2.9 | cna@vuldb.com via NIST National Vulnerability Database |
| 4.0 | CVSS 2.0 | Medium | — | — | VulDB via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N (score shown at the top: cna@vuldb.com) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
EPSS over time FIRST
Oct 21, 2026 → Oct 25, 2026 · 5 reading(s) · max 0.25%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Look for anomalous data read/export volumes and access to sensitive records.
Timeline
What happened to this CVE, newest first.
- 2026
- Source status changed · Received → Deferred
- Affected products added · a2aproject/a2a-rs
- Record published
- CVSS changed · 3.5
- Source status changed · → Received
- Record created in this database
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 20, 2026 – Oct 20, 2026
- 1× Official description updated · Oct 20, 2026 – Oct 20, 2026
References
10 on the record
- github.com/a2aproject/a2a-rs/commit/68f1b7e772ae5d6c9e581ac9b48bcddd10fe70eb
- github.com/a2aproject/a2a-rs/pull/122
- github.com/a2aproject/a2a-rs
- github.com/advisories/GHSA-j4c2-997p-844j
- vuldb.com/vuln/422868
- github.com/a2aproject/a2a-rs/
- nvd.nist.gov/vuln/detail/CVE-2026-113706
- vuldb.com/cve/CVE-2026-113706
- vuldb.com/submit/1015040
- vuldb.com/vuln/422868/cti
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-113707 a2aproject a2a-rs inmemory.rs update race condition 5d
- Medium CVE-2026-113705 a2aproject a2a-rs error.rs information exposure 5d
- High CVE-2026-113704 a2aproject a2a-rs Push Notification push_notification_sender.rs HttpPushSender server-side request forgery 5d
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No fixed version, patch or mitigation documented.
- No CISA SSVC assessment.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2026-113706 is "a2aproject a2a-rs inmemory.rs information disclosure", rated Low. It affects A2a-rs (A2aproject); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 3.5 describes technical severity. EPSS 0.25% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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