Description
`yaml` is a YAML parser and serialiser for JavaScript. Parsing a YAML document with a version of `yaml` on the 1.x branch prior to 1.10.3 or on the 2.x branch prior to 2.8.3 may throw a RangeError due to a stack overflow. The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a `RangeError: Maximum call stack size exceeded` with a small payload (~2–10 KB). The `RangeError` is not a `YAMLParseError`, so applications that only catch YAML-specific errors will encounter an unexpected exception type. Depending on the host application's exception handling, this can fail requests or terminate the Node.js process. Flow sequences allow deep nesting with minimal bytes (2 bytes per level: one `[` and one `]`). On the default Node.js stack, approximately 1,000–5,000 levels of nesting (2–10 KB input) exhaust the call stack. The exact threshold is environment-dependent (Node.js version, stack size, call stack depth at invocation). Note: the library's `Parser` (CST phase) uses a stack-based iterative approach and is not affected. Only the compose/resolve phase uses actual call-stack recursion. All three public parsing APIs are affected: `YAML.parse()`, `YAML.parseDocument()`, and `YAML.parseAllDocuments()`. Versions 1.10.3 and 2.8.3 contain a patch.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| eemeli | yaml | >= 2.0.0, < 2.8.3, >= 1.0.0, < 1.10.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | node-yaml | 2.8.3+~cs0.4.0-1 | — |
| Debian 13 | node-yaml | No fix yet | — |
| Debian 12 | node-yaml | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | node-yaml | No fix yet | — |
| Ubuntu 25.10 | node-yaml | No fix yet | — |
| Ubuntu 24.04 LTS | node-yaml | No fix yet | — |
| Ubuntu 22.04 LTS | node-yaml | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | alloy | 1.17.1-150700.15.23.1 | SUSE-SU-2026:2824-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | alloy | 1.17.0-160000.1.1 | SUSE-SU-2026:22575-1 |
| SLES 16.0 | alloy | 1.17.0-160000.1.1 | SUSE-SU-2026:22575-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | alloy | 1.17.0-1.1 | openSUSE-SU-2026:11053-1 |
| openSUSE Leap 16.0 | alloy | 1.17.0-160000.1.1 | openSUSE-SU-2026:21251-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | argo-workflows-ui-4.0 | 4.0.3-r2 | — |
| Wolfi rolling | katib-earlystopping +8 | 0.19.0-r31 | — |
| Wolfi rolling | katib-suggestion-goptuna-compat | 0.19.0-r40 | — |
| Wolfi rolling | langfuse-3-worker | 3.164.0-r7 | — |
| Wolfi rolling | lerna | 9.0.7-r2 | — |
| Wolfi rolling | nextcloud-server-33 | 33.0.6-r0 | — |
| Wolfi rolling | opensearch-dashboards-3-dashboards-reporting | 3.5.0-r11 | — |
| Wolfi rolling | prism | 5.14.3-r13 | — |
| Wolfi rolling | saf | 1.6.0-r0 | — |
| Wolfi rolling | tileserver-gl | 5.5.0-r11 | — |
| Wolfi rolling | vitess-23 | 23.0.3-r12 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
danwulff/astro_CVE-2026-33532 ★ 0 · Mar 27, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | yaml | >= 2.0.0, < 2.8.3 | 2.8.3 | GHSA-48c2-rrv3-qjmp |
| npm | yaml | >= 1.0.0, < 1.10.3 | 1.10.3 | GHSA-48c2-rrv3-qjmp |
Advisories 7
- WID-SEC-2026-3046 IBM Concert: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- WID-SEC-2026-2933 Splunk SOAR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 2, 2026
- WID-SEC-2026-1407 IBM App Connect Enterprise Certified Container: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 3, 2026
- SUSE-SU-2026:22575-1 Security update for alloy SUSE / openSUSE Security Updates · Jul 15, 2026
- SUSE-SU-2026:2824-1 Security update for alloy SUSE / openSUSE Security Updates · Jul 10, 2026
- openSUSE-SU-2026:21251-1 Security update for alloy SUSE / openSUSE Security Updates · Jul 9, 2026
- openSUSE-SU-2026:11053-1 alloy-1.17.0-1.1 on GA media SUSE / openSUSE Security Updates · Jun 19, 2026